#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <assert.h>
int main() {
	char a[] = "abcdeabcde";
	char b[] = "cde";
	char* ret = strstr(a, b);
	printf("%s\n", ret);
	return 0;
}